GENERAL HISTOLOGY

Detailed explanation-1: -Radial Canal The tube-foot is an elongated cylindrical structure that has a terminal super and an ampulla that helps in locomotion. A junction is present between the lateral vessels that aids in locomotion. The tube-feet extends whenever ampullae contracts.

Detailed explanation-2: -The radial canals in crinoids run along each arm into an ambulcral groove and tube feet. The ambulacral groove with its many cilia and hydraulically driven tube feet manipulate captured food down the ambulacral grooves along the arms down to the mouth, situated at the tegmen which is positioned at the base of the arms.

Detailed explanation-3: -Ampulla in Echinoderm Definition The organisms in this phylum contain tube feet which have a part called ampulla that is used for locomotion. The ampulla functions to stretch the tube feet and thereby help in the locomotion.

Detailed explanation-4: -Ampullae: A pouch or sack-like part of the sea star’s water vascular system that expands and contracts to move water up and down each tube foot. When the sea star wants to create a suction at the end of its tube foot, its ampullae pulls water out of the podia.